Butte Co Public Health reports In conjunction with the closure of all state funded COVID-19 Optum Serve testing sites throughout California, the Chico Optum Serve site, located on the Chico State campus, will permanently close at 12 p.m. on February 24, 2023. As COVID-19 activity is decreasing across the state, the phase out comes after the State recently announced a plan to end the COVID-19 public health emergency declaration on February 28, 2023.